/* Word breaks in strings. Copyright (C) 2001-2003, 2006-2018 Free Software Foundation, Inc. Written by Bruno Haible , 2009. This program is free software: you can redistribute it and/or modify it under the terms of either: * the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. or * the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. or both in parallel, as here. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program. If not, see . */ #include /* Specification. */ #include "uniwbrk.h" #include #include #include "c-ctype.h" #include "localcharset.h" #include "uniconv.h" #include "unilbrk/ulc-common.h" /* Word breaks of a string in an arbitrary encoding. We convert the input string to Unicode. The standardized Unicode encodings are UTF-8, UCS-2, UCS-4, UTF-16, UTF-16BE, UTF-16LE, UTF-7. UCS-2 supports only characters up to \U0000FFFF. UTF-16 and variants support only characters up to \U0010FFFF. UTF-7 is way too complex and not supported by glibc-2.1. UCS-4 specification leaves doubts about endianness and byte order mark. glibc currently interprets it as big endian without byte order mark, but this is not backed by an RFC. So we use UTF-8. It supports characters up to \U7FFFFFFF and is unambiguously defined. */ void ulc_wordbreaks (const char *s, size_t n, char *p) { if (n > 0) { const char *encoding = locale_charset (); if (is_utf8_encoding (encoding)) u8_wordbreaks ((const uint8_t *) s, n, p); else { /* Convert the string to UTF-8 and build a translation table from offsets into s to offsets into the translated string. */ size_t *offsets = (size_t *) malloc (n * sizeof (size_t)); if (offsets != NULL) { uint8_t *t; size_t m; t = u8_conv_from_encoding (encoding, iconveh_question_mark, s, n, offsets, NULL, &m); if (t != NULL) { char *q = (char *) (m > 0 ? malloc (m) : NULL); if (m == 0 || q != NULL) { size_t i; /* Determine the word breaks of the UTF-8 string. */ u8_wordbreaks (t, m, q); /* Translate the result back to the original string. */ memset (p, 0, n); for (i = 0; i < n; i++) if (offsets[i] != (size_t)(-1)) p[i] = q[offsets[i]]; free (q); free (t); free (offsets); return; } free (t); } free (offsets); } /* Impossible to convert. */ #if C_CTYPE_ASCII if (is_all_ascii (s, n)) { /* ASCII is a subset of UTF-8. */ u8_wordbreaks ((const uint8_t *) s, n, p); return; } #endif /* We have a non-ASCII string and cannot convert it. Don't produce any word breaks. */ memset (p, 0, n); } } } #ifdef TEST #include #include #include /* Read the contents of an input stream, and return it, terminated with a NUL byte. */ char * read_file (FILE *stream) { #define BUFSIZE 4096 char *buf = NULL; int alloc = 0; int size = 0; int count; while (! feof (stream)) { if (size + BUFSIZE > alloc) { alloc = alloc + alloc / 2; if (alloc < size + BUFSIZE) alloc = size + BUFSIZE; buf = realloc (buf, alloc); if (buf == NULL) { fprintf (stderr, "out of memory\n"); exit (1); } } count = fread (buf + size, 1, BUFSIZE, stream); if (count == 0) { if (ferror (stream)) { perror ("fread"); exit (1); } } else size += count; } buf = realloc (buf, size + 1); if (buf == NULL) { fprintf (stderr, "out of memory\n"); exit (1); } buf[size] = '\0'; return buf; #undef BUFSIZE } int main (int argc, char * argv[]) { setlocale (LC_CTYPE, ""); if (argc == 1) { /* Display all the word breaks in the input string. */ char *input = read_file (stdin); int length = strlen (input); char *breaks = malloc (length); int i; ulc_wordbreaks (input, length, breaks); for (i = 0; i < length; i++) { switch (breaks[i]) { case 1: putc ('|', stdout); break; case 0: break; default: abort (); } putc (input[i], stdout); } free (breaks); return 0; } else return 1; } #endif /* TEST */